Process for obtaining refined lead.



. f UNITED STATES PATENT? JULIus asnncmor xnnnrscnnm-wnsrnawnnnj warrant;

'rno'cnss ron. on'rnmme REFI E EADQ;

1,025,956. No Drawing.

.To all whom it may concern.

Be it known that I, JULIUS ASBECK, mining engineer, residing at Krantscheid-Westerwald, Germany, have invented certain new and usefu-l lmprove'ments 'in Processes for Obtaining Refined Lead, of which'the following is a s ecification.

process, it also has an advantage over all former processes in that it can be carried out in the melting pot at a low temperature.

-' The process consists in the heating of the lead-bearing material together with a mix ture of caustic alkali and sulfur or sulfurv containing compounds. It is probable thatlead-sulfid is formed in the first stage, which in the second stage is reduced by the caustic alkali, atthe same tiine'forming sulfiteor 1ead-bearing materials, are not reduced by this process, and the metallic impurities such as copper, antimony, arsenic and tin, are either oxidized or sulfurized, and enter into the dross or slag,'so that perfectly pure lead is also obtained from impure Working material; i

An appropriate mixture consists of three parts 0 caustic soda to bne -('part of sulfur, or equal parts of caustic fso a and sodium thiosulfate, or three parts'of toone polys'uliid. The lead-bearing materials are .mixed with one of these mixtures and'heatedf up we temperature 0ff4=00-500 centigrade eforashort time.

caustic soda and sevent The object o the present process is totion.

I ratin the lead from the slag.- sulfate of the alkalis in question. The for eign metals present as compounds in the.

art of sulfi'd-of sodium or sodium Speciflcation'of Letters Patent. Pat entiedMay 1 4, 1912. n plicationfiledllay 20,1910. serial n scaawy i 1 F or furtherexplanation it may be saidthat certain lead prior totreatment contained the following: copper 084%, nickel .0076% silver .008%; Five thousand pounds of such lead were employed along with thirty pounds of caustic soda (90% pure). pounds of sulfid of sodium pure The treatment was re eated three times! and thereafter the lea contained copper .0072%, nickel .008% and silxver .0081%. The pro ortions and results will vary somewhat an the presence or absence of dross in the'lead to be treated will have its influence upon the number of times the treatment is to be repeated. However, 7 from the fore oing illustration those skilled in the .art w1l-be able to-obtain advanta geous results by the practice .of the invensists in a ding a sulfid'producing substance and caustic alkalithereto and mixing the ingredients in a molten condition and sepasists in'a ding analkaline 'sulfid and cause;

the lead from the slag.-

he recess of refining lead which'conv 3. The recess of refining lead which con- I sists in a ding sulfid of sodium and caustic soda thereto. and miizing the ingredients in? Ta molten condition and. separating the lead"; from the slag.

in presence of twowitnesses. p

7' f' v I JULIUS ASBECIC Witiissesf u y v I Louis Vannonr, y 'Bnssr'nF; DUNLAP.

- I Intestimony'whereofl aifix mysignature 

